1. Thromboplastin , by itself, could activate the extrinsic coagulation pathway.2. This test is called the aPTT, or activated partial thromboplastin time. 3. However, partial thromboplastin is just phospholipids, and not tissue factor. 4. S, partial thromboplastin time ( PTT ) was above 200 5. Plasma prekallikrein deficiency causes a prolonged activated partial thromboplastin time in patients. 6. Partial thromboplastin was used to measure the intrinsic pathway. 7. When manipulated in the laboratory, a derivative could be created called partial thromboplastin . 8. Phospholipid is available as an independent reagent or in combination with tissue factor as thromboplastin . 9. It was not until much later that the subcomponents of thromboplastin and partial thromboplastin were identified. 10. It was not until much later that the subcomponents of thromboplastin and partial thromboplastin were identified.